Audio-to-audio encompasses speech enhancement, voice conversion, source separation, and style transfer — any task where audio goes in and transformed audio comes out. Speech enhancement (denoising) was revolutionized by Meta's Demucs and Microsoft's DCCRN, now used in every video call; voice conversion took a leap with RVC and So-VITS-SVC enabling zero-shot voice cloning that sparked both creative tools and deepfake concerns. Source separation (isolating vocals, drums, bass from a mix) reached near-production quality with HTDemucs and Band-Split RNN, making stems extraction a solved problem for most music. The field is converging toward unified models that handle multiple audio transformations through natural language instructions, blurring the line with text-to-audio generation.
Deep noise suppression on Microsoft DNS challenge data
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